fast of the firstborn(n = noun.time) - (Judaism) a minor fast day on Nissan 14 that is observed only by firstborn males; it is observed on the day before Passover;
is a kind of minor fast day
fast, fast and loose, fast asleep, fast break, fast buck, fast day, fast dye, fast food, fast lane, fast of ab, fast of av, fast of esther, fast of gedaliah, fast of tammuz, fast of tevet, fast one, fast reactor, fast time scale, fast track, firstborn, hard and fast, hold fast, major fast day, minor fast day, pull a fast one, pull a fast one on, stand fast, very fast